I just rebuilt the mesh for this character. Smooth shading creates odd eye shadows
I think your normals are not facing the same direction as @moonboots said.
You can check them by using two buttons in the viewport overlay panel
The &quot;Face orientations&quot; button and the &quot;face normals&quot; button (at the bottom, see screen) 
both of them will allow you to check in which direction your normals are facing.
Don't forget to set an appropriate size when you're using the &quot;face normals&quot; option.
You can also recompute them by going into : (when in edit mode)
Mesh -&gt; Normal -&gt; Recalculate outside